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-rw-r--r--target/linux/mvebu/patches-4.4/400-mvneta-tx-queue-workaround.patch36
1 files changed, 36 insertions, 0 deletions
diff --git a/target/linux/mvebu/patches-4.4/400-mvneta-tx-queue-workaround.patch b/target/linux/mvebu/patches-4.4/400-mvneta-tx-queue-workaround.patch
new file mode 100644
index 0000000000..5dba311d93
--- /dev/null
+++ b/target/linux/mvebu/patches-4.4/400-mvneta-tx-queue-workaround.patch
@@ -0,0 +1,36 @@
+The hardware queue scheduling is apparently configured with fixed
+priorities, which creates a nasty fairness issue where traffic from one
+CPU can starve traffic from all other CPUs.
+
+Work around this issue by forcing all tx packets to go through one CPU,
+until this issue is fixed properly.
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+--- a/drivers/net/ethernet/marvell/mvneta.c
++++ b/drivers/net/ethernet/marvell/mvneta.c
+@@ -3984,6 +3984,16 @@ static int mvneta_ethtool_set_eee(struct
+ return phylink_ethtool_set_eee(pp->phylink, eee);
+ }
+
++static u16 mvneta_select_queue(struct net_device *dev, struct sk_buff *skb,
++ void *accel_priv,
++ select_queue_fallback_t fallback)
++{
++ /* XXX: hardware queue scheduling is broken,
++ * use only one queue until it is fixed */
++ return 0;
++}
++
++
+ static const struct net_device_ops mvneta_netdev_ops = {
+ .ndo_open = mvneta_open,
+ .ndo_stop = mvneta_stop,
+@@ -3994,6 +4004,7 @@ static const struct net_device_ops mvnet
+ .ndo_fix_features = mvneta_fix_features,
+ .ndo_get_stats64 = mvneta_get_stats64,
+ .ndo_do_ioctl = mvneta_ioctl,
++ .ndo_select_queue = mvneta_select_queue,
+ };
+
+ const struct ethtool_ops mvneta_eth_tool_ops = {